What is the typical way the compressor and turbine disks connected to (LP/HP) shaft ? How are the disks connected to each other (e.g., curvic coupling, bolts or others ?)
Typically the blades must not be too rigid but flexible. Ideally, the fir tree method is used to lock the blade root onto the disk, although there is its other counterpart.
Overall, you have the blades being attached to the disk, the disk attached to the drum and finally the drum to the spool/shaft. However, you must understand that each configuration or the methods used will vary from manufacturers to manufacturers and the type of engine under consideration. For example the centrifugal compressor and axial flow compressor. Hope this help.